Dropdown selectedindexchanged event not firing event the autopostback=true and also i tried causes validation to false/true but not luck here is the code
<asp:DropDownList ID="DropDownList15" runat="server" EnableViewState="true"
CausesValidation="false" AutoPostBack="True" DataSourceID="ds_Country"
DataTextField="Country" style="margin-left:70px;"
DataValueField="CountryId" AppendDataBoundItems="True"
onselectedindexchanged="ddlCountry_SelectedIndexChanged1"> </asp:DropDownList>
code behind is simple like
protected void ddlCountry_SelectedIndexChanged1(object sender, EventArgs e)
{
Session["CountryId"] = ddlCountry.SelectedValue.ToString();
}
Related
Inherited code with a dropdownlist which is used to populate some GridViews. When a selection is made in the dropdownlist, the selection does not keep and it jumps back up to the first record. A requently mentioned fix is to add the !Page.IsPostBack in the Page_Load event, however in doing so does not resolve the issue.
<asp:DropDownList ID="DropDownList2" runat="server" AutoPostBack="true"
DataSourceID="SqlDataSource2" DataTextField="FullAddress"
DataValueField="UniqueRecordID" Width="445px" Height="20px"
style="margin-left: 0px" TabIndex="8" AppendDataBoundItems="true"
OnSelectedIndexChanged="resetGridsAndLabel">
</asp:DropDownList>
public partial class _Default : Page
{
protected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
{
DropDownList2.DataSource = sqlDataSource2;
DropDownList2.DataBind();
}
Are you setting the data source for the DDL anywhere else on the page?
I want to auto click the search button whenever user select a value from drop down list.
code snippet:
Added the event handler in InitializeComponent() :
this.ddltrim.SelectedIndexChanged += new System.EventHandler(this.ddltrim_SelectedIndexChanged);
code:
private void ddltrim_SelectedIndexChanged(object sender, System.EventArgs e)
{
if(ddlStores.Items.Count ==1)
btnSearch_Click("Search", null);
}
In designer:
<asp:dropdownlist id=ddltrim width="100%" Runat="server" AutoPostBack="True" EnableViewState="True">
<asp:ListItem Value="Select Submodel" Selected="True">
Select SubModel
</asp:ListItem></asp:dropdownlist>
But selectIndexChanged in not firing when i select any value from ddl. Have to manually click the button search.
Try
<asp:dropdownlist id=ddltrim width="100%" Runat="server" AutoPostBack="True" EnableViewState="True" onselectedindexchanged="ddltrim_SelectedIndexChanged">
<asp:ListItem Value="Select Submodel" Selected="True">Select SubModel</asp:ListItem>
Try to set your add event code in Page_PreInit method
protected void Page_PreInit(object sender, EventArgs e)
{
this.ddltrim.SelectedIndexChanged += new System.EventHandler(this.ddltrim_SelectedIndexChanged);
}
I have a listbox in asp.net
<asp:ListBox ID="ListBox1" class="listItem" runat="server"
onselectedindexchanged="ListBox1_SelectedIndexChanged">
<asp:ListItem>1</asp:ListItem>
<asp:ListItem>2</asp:ListItem>
<asp:ListItem>3</asp:ListItem>
</asp:ListBox>
I want to trigger a function when somebody changes it values...
code which i tried is
protected void ListBox1_SelectedIndexChanged(object sender, EventArgs e)
{
Label6.Text = Label6.Text + "hello";
}
What's wrong here..
By setting the autopostback as true, my problem is solved but the page is reloaded everytime i change its value which i dnt want as large amount of data get reloaded on every autopostback(bcoz of images on the page).Even i put the following code in page load
protected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
{
}
}
but it didnt work out...
The problem here is that you expect that the SelectedIndexChanged event is triggered immediately. But by default the ListControl's AutoPostBack property is set to false.
true if a postback to the server automatically occurs whenever the
user changes the selection of the list; otherwise, false. The default
is false.
So set it to true:
<asp:ListBox ID="ListBox1" AutoPostBack="true" class="listItem" runat="server"
onselectedindexchanged="ListBox1_SelectedIndexChanged">
<asp:ListItem>1</asp:ListItem>
<asp:ListItem>2</asp:ListItem>
<asp:ListItem>3</asp:ListItem>
</asp:ListBox>
AutoPostBack="true" is missing add it on ListBox1
After searching I've found a number of suggestions, but none of them are fixing the issue.
<asp:TextBox runat="server" ID="uid" AutoPostBack="True" Text=""></asp:TextBox>
In the properties window, EnableViewState = True for the TextBox (Suggested here). I am typing a new value into the TextBox and then hitting the Tab key. Nothing happens nor does the break point at if(IsPostBack...) break.
Code Behind:
protected void Page_Load(object sender, EventArgs e)
{
if(IsPostBack && uid.Text != "" && pw.Text == "")
{
Do stuff
}
}
UPDATE: Other TextBox setups I've tried:
<asp:TextBox runat="server" ID="uid" Text="" AutoPostBack="True" OnTextChanged="UidTextChanged"></asp:TextBox>
protected void UidTextChanged(object sender, EventArgs e)
{
ClientScript.RegisterStartupScript(GetType(), "alert", "alert('it works');", true);
}
And
<asp:TextBox runat="server" ID="uid" AutoPostBack="True" Text="" onblur="__doPostBack('','');" OnTextChanged="UidTextChanged"></asp:TextBox>
And
<asp:TextBox runat="server" ID="uid" AutoPostBack="True" Text="" onblur="__doPostBack('','');"></asp:TextBox>
Whenever AutoPostBack is set to true, I receive the following error in the browser console:
"Uncaught TypeError: Property 'submit' of object #<HTMLFormElement> is not a function
__doPostBack
(anonymous function)"
When I have the onblur property set, I receive the exact same error except instead of anonymous function it says onblur.
You could add a javascript event to the onblur for it. onblur='__doPostBack('','');'
That would cause your text box to cause a postback once it is tabbed out of.
Edit: It should be " not ' <asp:TextBox ID="TextBox1" runat="server" onblur="__doPostBack('','');" /> Just tried that and it works. Try removing the AutoPostBack="True"
Edit 2: Base on your pastebin....
<asp:Button runat="server" UseSubmitBehavior="True" ID="submit" Text="Save"
onclick="SubmitClick"/>
You can't have an ID of "submit". Change that to "btnSubmit" and the Javascript solution will work and I bet the Auopostback solution will too.
http://www.xpertdeveloper.com/2012/05/property-submit-of-object-is-not-a-function/ will explain the problem.
You can add OnTextChanged="TextBox1_TextChanged" on your textBox
Nota : It's important to set event fire, no just AutoPostBack="true".
<asp:TextBox runat="server" ID="uid" AutoPostBack="True" Text="" OnTextChanged="TextBox1_TextChanged"></asp:TextBox>
Code Behind:
protected void TextBox1_TextChanged(object sender, System.EventArgs e) {
.....
}
My Scenario,
When i select the option in list i need to perform some action like Textbox should be disabled. But i don find my breakpoint pointing to that action to be performed.Pls help
I guess you mean the SelectedIndexChanged event does not fire that is so because you'vent set the AutoPostBack to true.
<asp:RadioButtonList ID="RadioButtonList1" runat="server" AutoPostBack="True"
onselectedindexchanged="RadioButtonList1_SelectedIndexChanged">
</asp:RadioButtonList>
Code
protected void RadioButtonList1_SelectedIndexChanged(object sender, EventArgs e)
{
TextBox4.Enabled = false;
}